Entity-no-entity (#17)

src/index.ts

@@ -13,6 +13,7 @@ import simpleInaccessible from "./test-cases/simple-inaccessible";
 import enumIntersection from "./test-cases/enum-intersection";
 import inputObjectIntersection from "./test-cases/input-object-intersection";
 import requiresWithFragments from "./test-cases/requires-with-fragments";
+import entityAndNoEntity from "./test-cases/entity-and-no-entity";
 
 const testCases = [
   unionIntersectionTestCase,
@@ -29,6 +30,7 @@ const testCases = [
   enumIntersection,
   inputObjectIntersection,
   requiresWithFragments,
+  entityAndNoEntity,
 ];
 
 function routerFetch(request: Request) {

src/test-cases/entity-and-no-entity/a.subgraph.ts

@@ -0,0 +1,27 @@
+import { createSubgraph } from "../../subgraph";
+import { users } from "./data";
+
+export default createSubgraph("a", {
+  typeDefs: /* GraphQL */ `
+    extend schema
+      @link(
+        url: "https://specs.apollo.dev/federation/v2.3"
+        import: ["@shareable"]
+      )
+
+    type User {
+      id: ID @shareable
+    }
+
+    type Query {
+      users: [User!]!
+    }
+  `,
+  resolvers: {
+    Query: {
+      users() {
+        return users.map((u) => ({ __typename: "User", id: u.id }));
+      },
+    },
+  },
+});

src/test-cases/entity-and-no-entity/b.subgraph.ts

@@ -0,0 +1,44 @@
+import { createSubgraph } from "../../subgraph";
+
+import { users } from "./data";
+
+export default createSubgraph("b", {
+  typeDefs: /* GraphQL */ `
+    extend schema
+      @link(
+        url: "https://specs.apollo.dev/federation/v2.3"
+        import: ["@shareable", "@key"]
+      )
+
+    union Account = User | Admin
+
+    type User @key(fields: "id") {
+      id: ID!
+      name: String
+    }
+
+    type Admin {
+      id: ID
+      photo: String @shareable
+    }
+
+    type Query {
+      accounts: [Account!]!
+    }
+  `,
+  resolvers: {
+    Query: {
+      accounts() {
+        return [
+          ...users.map((user) => ({ __typename: "User", ...user })),
+          { __typename: "Admin", id: "a1", photo: "a1-photo" },
+        ];
+      },
+    },
+    User: {
+      __resolveReference(key: { id: string }) {
+        return users.find((user) => user.id === key.id);
+      },
+    },
+  },
+});

src/test-cases/entity-and-no-entity/data.ts

@@ -0,0 +1,6 @@
+export const users = [
+  {
+    id: "n1",
+    name: "n1-profile",
+  },
+];

src/test-cases/entity-and-no-entity/index.ts

@@ -0,0 +1,6 @@
+import { serve } from "../../supergraph";
+import a from "./a.subgraph";
+import b from "./b.subgraph";
+import test from "./test";
+
+export default serve("entity-and-no-entity", [a, b], test);

src/test-cases/entity-and-no-entity/test.ts

@@ -0,0 +1,44 @@
+import { createTest } from "../../test";
+
+export default [
+  createTest(
+    /* GraphQL */ `
+      query {
+        users {
+          id
+          name
+        }
+        accounts {
+          ... on User {
+            id
+            name
+          }
+          ... on Admin {
+            id
+            photo
+          }
+        }
+      }
+    `,
+    {
+      data: {
+        users: [
+          {
+            id: "n1",
+            name: "n1-profile",
+          },
+        ],
+        accounts: [
+          {
+            id: "n1",
+            name: "n1-profile",
+          },
+          {
+            id: "a1",
+            photo: "a1-photo",
+          },
+        ],
+      },
+    }
+  ),
+];